dirty-react-component.js

// ...

render() {
  return (
    <div>
      <Button
        label='Click me to increment!'
        onClicked={() => { this.setState({count: this.state.count + 1}) }}
      />
      <Button
        label='Click me to decrement!'
        onClicked={() => { this.setState({count: this.state.count - 1}) }}
      />
    </div>
  );
}

// ...